Frequencies of Devotion

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2026-05-28 13:28:18 -

Sound changes as it moves. A siren approaching sounds higher; a siren receding sounds lower. This is the Doppler effect—the compression and expansion of waves as their source moves relative to the observer. The siren itself does not change. The frequency of its emission is constant. But the frequency at which you receive it depends on your position. The same sound, heard from different...

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